Motion Tracking Markers don't show up!
What you are missing is solving the scene if you want motion reconstruction in 3d.
In the solve tab press Solve Camera Motion

Once the scene is solved, open the scene setup and press Setup Tracking Scene.

That will add a camera tracking constraint to the camera that is linked to the track information and camera solution.
To view the video through the camera view, press Set as Background
Additionally you could also add empties to the scene to match the trackers. Press Link Empty to Track